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scsi: make SCSIRequest refcount atomic

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2025-10-28 14:50:07 +01:00
parent 59d8f86442
commit 7e7df20724
1 changed files with 4 additions and 9 deletions
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hw/scsi/scsi-bus.c
+4 -9
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@@ -823,7 +823,6 @@ SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
{
SCSIRequest *req;
SCSIBus *bus = scsi_bus_from_device(d);
BusState *qbus = BUS(bus);
const int memset_off = offsetof(SCSIRequest, sense)
+ sizeof(req->sense);
@@ -838,8 +837,6 @@ SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, SCSIDevice *d,
req->status = -1;
req->host_status = -1;
req->ops = reqops;
object_ref(OBJECT(d));
object_ref(OBJECT(qbus->parent));
notifier_list_init(&req->cancel_notifiers);
if (reqops->init_req) {
@@ -1496,15 +1493,15 @@ void scsi_device_report_change(SCSIDevice *dev, SCSISense sense)
SCSIRequest *scsi_req_ref(SCSIRequest *req)
{
assert(req->refcount > 0);
req->refcount++;
assert(qatomic_read(&req->refcount) > 0);
qatomic_inc(&req->refcount);
return req;
}
void scsi_req_unref(SCSIRequest *req)
{
assert(req->refcount > 0);
if (--req->refcount == 0) {
assert(qatomic_read(&req->refcount) > 0);
if (qatomic_fetch_dec(&req->refcount) == 1) {
BusState *qbus = req->dev->qdev.parent_bus;
SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, qbus);
@@ -1514,8 +1511,6 @@ void scsi_req_unref(SCSIRequest *req)
if (req->ops->free_req) {
req->ops->free_req(req);
}
object_unref(OBJECT(req->dev));
object_unref(OBJECT(qbus->parent));
g_free(req);
}
}